Vision ======== * Base city vision radius sq 5 * City vision radius increased in size 15 cities * City vision radius increased when player knows Radar Migration =========== * People may spontaneously migrate to better city * Culture affects city migration score slightly Veteran Levels ============== * Military units have four veterancy levels * Workers have three veterancy levels and their speed increases as they gain those levels * Diplomat units have three veterancy levels * Regular buildings enabling building of veteran units give two veterancy levels. Wonders giving such bonuses give just one veteran level. Effects from regular buildings and wonders are cumulative.